Window with top roller shutter and frame extension

I just asked myself that too .... ?!?

Rhenish greetings

What does your statement refer to?? To the strange dimension of the window opening? Or to the frame widening?

I can't tell you what was thought about it. The house dates from 1930.

But I can't imagine being the only one with this problem.

The current windows have frames partly 8 cm wide, and then the width differences of 1-2 cm were plastered over with gypsum!

Regards

What does your statement refer to?? To the strange dimension of the window opening? Or to the frame widening?

To the offset in the window.

I can’t tell you what ma. was thinking. The house is from 1930.

That just shows what information is worth.

If you go to the facade, a building application must be submitted; have you done that?
Does the facade, or rather its current window arrangement/shape have to be retained?
Are the windows already ordered?

Rhenish greetings

No, windows have not been ordered, I can take the wind out of your sails in advance. The facade remains untouched. I don't know how you came to that conclusion. Besides, no building application is required here for the replacement of the windows. Only a change in the facade color or insulation would require one. Since the facade will be renovated in the coming years, this will become an issue then. The current windows have no special features. No muntins or the like. There is no monument protection.

To get back to the topic, do you have an answer to my actual question?

"How do the guide rails of the [Aufsatzrolllos] behave with a frame widening?"

Hello Extexo,
Your windows have an internal stop. This is very common in existing buildings. It was made to provide constructive protection for the external joint between the wall and the window. This is also beneficial for resistance against driving rain. By the way, this is still used today, although the stop nowadays consists of insulation material from the ETICS and is installed afterwards.
The guide rails do not become wider. Instead, they are set back. Ideally, so far that about 1.5 cm still protrudes. The exact measurement is a matter of taste. You should also let some of the frame protrude so that the dimension of the frame extensions almost calculates itself. You can have the roller shutter box run across the entire width of the element or cut out the extensions and have part of it run past the shorter roller shutter box. This depends on your specific connection situation.
Please remember to specify how far the guide is set back when ordering the retrofitted roller shutter so that the roller shutter curtain is cut accordingly.

Regards, redtatoo